Some ketchup gets spilled on a napkin where you have written the last digit of your friend's ten digit phone number. What is the maximum number of phone calls you would need to try in order to know what your friend's number is?
Write your name, homeroom number, and your answer on a piece of paper and give it to Mr. Restoule General in the Resource Room. This week's winner will be drawn from all the correct submissions on Wednesday, October 30th and win a special Halloween prize! Good luck.
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